Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Formation of Zn(II) Complexes of Physiological Buffer Amino alcohols in Aqueous Solution

수용액 중에서 생리학적 완충제 아미노 알코올과 Zn(II) 이온과의 착물 형성

  • 홍경희 (삼육보건대학교 간호학과) ;
  • 전용진 (청운대학교 화장품과학과)
  • Received : 2015.09.25
  • Accepted : 2015.11.06
  • Published : 2015.11.30
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Abstract

The complex formation from Zn(II) ion and 2-(2-hydroxyethylamino)-2-(hydroxymethyl)-1,3-propanediol (Monotris), Bis(2-hydroxyethyl)imino-tris(hydroxymethyl)methane(Bistris) in aqueous solution at $25^{\circ}C$ and at an ionic strength of 0.10 M have been studied potentiometrically. For the Zn(II)-Monotris system, in the Monotris (L) complex $ZnL^{2+}$, one of the hydroxyl oxygen atoms as well as the amine nitrogen of the ligand are coordinated. In basic media, the coordinated hydroxyl group is deprotonated. For the Zn(II)-Bistris system, in the Bistris(L) complex $ZnL^{2+}$, two of the hydroxyl oxygen atoms as well as the amine nitrogen of the ligand are coordinated. In basic media, one of the coordinated hydroxyl groups is deprotonated. In very high basic media, an additional hydroxyl group undergoes deprotonation. The equilibrium constants for the formation of $ZnL^{2+}$, $ZnLH_{-1}{^+}$, $ZnLH_{-2}$, $Zn_2L_2H_{-2}{^{2+}}$ and $Zn_2L_2H_{-3}{^+}$ have been determined.

이온강도 0.10 M, $25^{\circ}C$ 수용액에서 Zn(II)이온과 2-(2-hydroxyethylamino)-2-(hydroxymethyl)-1,3-propa nediol(Monotris), Bis(2-hydroxyethyl)imino-tris(hydroxymethyl)methane(Bistris)과의 착물 형성을 전위차법으로 연구하였다. Zn(II)-Monotris 시스템에서 Monotris(L) 착물 $ZnL^{2+}$는 리간드의 히드록실 산소 원자 중에서 한 개의 산소 원자 뿐만 아니라 아민 질소가 배위되었다. 배위되어 있던 히드록실기의 수소 이온이 염기성 영역에서 해리되었다. Zn(II)-Bistris 시스템에서 Bistris(L) 착물 $ZnL^{2+}$는 리간드의 히드록실 산소 원자 중에서 두 개의 산소 원자 뿐만 아니라 아민 질소가 배위되었다. 배위되어 있던 히드록실기들 중 한 개의 히드록실기에서 수소 이온이 염기성 영역에서 해리되었다. 추가적으로 다른 한 개의 히드록실기에서 수소이온이 강염기 영역에서 해리되었다. $ZnL^{2+}$, $ZnLH_{-1}{^+}$, $ZnLH_{-2}$, $Zn_2L_2H_{-2}{^{2+}}$ 그리고 $Zn_2L_2H_{-3}{^+}$의 평형 상수값을 계산하였다.

Keywords

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